Paper strip



June 11, 1929. J. c. SHERMAN PAPER STRIP Filed March 28, 1927 Patented June 11, 1929.

UNITE STATES PATENT OFFICE.

1 JOHN C. SHERMAN, OF GORHAM, MAINE, ASSIGNOR TO BROWN COMPANY, OF BER-LIN,

NEW HAMPSHIRE, A. CORPORATION OF MAINE.

PAPER STRIP.

Original application filed May 4, 1925, Serial No. 27,705. Divided and this application filed. March 28, 1927. Serial No. 178,831.

ture of rovings or yarn, more especially by the method and apparatus for producing such rovings or yarn disclosed in my Patent No. 1,542,915 granted June 23, 1925, for paper yarn and process of producing the same. The mechanism shown in this patent is capable of forming rovings at the high speed at which a paper machine may be operated, and the present invention has to do with strips of pulp, partially dried, which may be made by such apparatus as is described and claimed in my previously mentioned application No. 27,705, and fed directly to a suitable yarn-making machine without intermediate handling. For the manufacture of paper strips embodying the present invention, the pulp pick-up device, which may be a cylinder mold, is formed on its surface with a plurality of se ries of spaced alined ridges acting to produce slits definin g partial lines of severance of the sheet being formed. As the pulp web is at this time relatively wet and weak, the strips are not formed completely separated but are left attached at intervals between the alined slits to present a sheet form in order that the material may be more readily handled. Individual strips at this stage of the manufacture would be excessively delicate. The pulp web is taken off the mold on a blanket in the usual manner and after removal from the blanket the severing of individual strips is completed. In order to insure that the action of the severing mechanism shall be in line with the slits formed in the web as made, mechanism for correctly relating the severing mechanism and the Web should be provided. The strips as thus severed are still somewhat wet and are in proper condition to be fed directly to the roving forming mechanism which utilizes such wet strips as its material to be operated upon.

For a more complete understanding of this invention, reference may be had to the accompanying drawings in which Figure 1 illustrates a portion of a strip embodying this invention.

Figures 2, 3 and 4 are detail portions of the cylinder mold surface showing different constructions.

Figure 5 is a fragmentary cross section of the mold constructed according to the showing of Figure 3.

Figure 6 is a detail section on line 66 of F 1 gure 5.

Figure 7 is a perspective of a portion of the web of partially compacted paper as removed from the cylinder mold.

Figure 8 is a diagrammatic view illustrating the formation of the web on the paper machine and the completion of its severance into strips suitable for the roving making machine.

Referring to Figures 2, 3, 4 and 7, various ways of forming the cylinder mold to produce the desired web partially severed into strips are illustrated. The cylinder mold presents a wire mesh surface on which the pulp is deposited and according to this invention this surface is broken up by a plurality of series of alined ridges or fixed deckles which project from the surface of the wire so as to prevent the deposit of the pulp on these portions. In Figure 2 these ribs are shown as formed of sections of wire 1 inserted through openings 2 in the wire mesh surface and having their ends 3 projecting inwardly of this wire mesh. folded toward each other against the mesh so as to leave the portions l projecting above the surface of the mesh. These wires are arranged in alined relation, but spaced apart so as to form series of alined slots 5 spaced laterally from each other as illustrated in Figure 7. Preferably the slots are staggered, thus to increase the strength of the web 10 as taken from the cylinder mold for further treatment.

Instead of forming the slot defining ribs in the manner illustrated in Figures 3, 5 and 6, they may be formed by continuous wires 11 having alternate portions 12 and 13 lying above and below the pulp-receiving surface of the wire mesh 14. In Figure 4 another means for forming these slots is shown, comprising bars 20 or metal ribbons or intermittent strips of solder soldered or otherwise fixed to the outer face of the wire mesh 14:. \Vith any of these constructions the web as taken oil from the web forming mechanism is substantially as illustrated in Figure 7, having parallel series of spaced alined slots 5 therein. The cylinder mold 26 picks up the pulp from the vat 25, as illustrated diagrammaticall y in Figure 8. The pulp is taken ott on the blanket 27 at the couch roll 28, and passes along the blanket over the roll 29 and between the squeeze rolls 30. The web of pulp is then separated from the blanket, the blanket returning about the rolls 81, and 33 in any usual or suitable manner. The web is then sutliciently strong to be handled by itself, but it still contains considerable water. it is then in condition to be completely severed into strips of wet partially formed paper which are in condition to be delivered directly to the roving "forming mechanism.

In order to complete the separation of the strips from the sheet which leaves the blanketin slotted condition as shown in Figure 7, the sheet may be passed over a roll opposed to which is a pipe extending parallel to the axis of the roll and situated near its surface. This pipe is provided with suitable nozzles arranged to register with the slots 5 of the sheet passing over the roll 55, the latter also being provided with peripheral slots to register with the nozzles and with the slots 5 in the sheet. Suitable fluid such as air, steam or water is supplied under pressure to the pipe 65. Jet's of this fluid are thus directed against the sheet of soft wet pulp in line with the slots 5 with the result that the severance oi? the strips along the lines of the slots is thus completed. As the material is thus torn or washed away from the remaining portions of the web, the edges of the strips at. these points are left somewhat more ragged than the edges of the slotted portions which are produced by the ridges on the surface of the cylinder mold, as is illustrated in Figure 1. When these strips are being formed into rorings in the manner illustrated in the patent liui'Oll'lliOfOl'O re t'erred to, these roughened edges are advantageous in that they facilitate the engagement of the edge fibers with those within the edges of the strip and tend to in crease the interlocking or interfelting of the fibers in the roving material.

By this mechanism it is clear that the pulp is first formed as a web partially severed by slots into strips and that when the pulp has become sutliciently dry to possess sutlicient strength for handling, it is completely severed into strips by cutting out the bridges of pulp between the ends of alined slots, and that the strips delivered from the drum are then still moist and suitable for making into rovings.

It should be noted that this invention is not limited to the use of the described apparatus at the location indicated in the drawings. Thus, it is possible to cause the pulp to be separated into narrow strips after the application of one set of squeeze rolls after being removed from the blanket and prior to the application thereto Of a second set of squeeze rolls, and several such variations oi the sequence of ('q ierations are obvious to any one familia r with the paper-making arts. It would also be within the scope of the present invention to permit the paper to dry before completing its severance into strips, though generally this would not be preferred.

Having thus described certain embodiments o'l. this invention it should be evidentto those skilled in the art that various changes and modiliaitions might be made therein without departing from its spirit or scope as defined by the appended claims.

I claim l. A strip of partially formed paper suit-' able for making a roving, each edge thereof having spaced rough portions.

2. A strip of partially formed paper suitable tor making a roving and having spaced rough edge portions alternating on opposite edges.

3. A strip oi partially formed paper suitable ttor making a roving, each edge thereof having alternating molded and ruptured portions.

4. A strip of partially formed paper suitable tor making a roving, each edge thereof having relatively short ruptured portions and relatively long molded portions in alternation, the ruptured portions of the opposite edges of the strip being staggered.

5. A strip of partially formed paper suitable for making a roving having discontinuous deckle edges.

In testimony whereof I have aiiixed my signature.

JOHN C. SHELh IAN. 

